Update Try Dart to new scanner behavior.

dart/site/try/src/editor.dart

Index: dart/site/try/src/editor.dart
diff --git a/dart/site/try/src/editor.dart b/dart/site/try/src/editor.dart
index bc80134611903092a7420be2a7a3dcf9901869fd..d330a7b7446577641d0b633b3c5b743114753837 100644
--- a/dart/site/try/src/editor.dart
+++ b/dart/site/try/src/editor.dart
@@ -6,9 +6,9 @@ library trydart.editor;
 
 import 'dart:html';
 
-import 'package:compiler/implementation/scanner/scannerlib.dart'
-  show
+import 'package:compiler/implementation/scanner/scannerlib.dart' show
     EOF_TOKEN,
+    ErrorToken,
     StringScanner,
     Token;
 
@@ -200,6 +200,10 @@ void inlineChildren(Element element) {
 }
 
 Decoration getDecoration(Token token) {
+  if (token is ErrorToken) {
+    isMalformedInput = true;
+    return new DiagnosticDecoration('error', token.assertionMessage);
+  }
   String tokenValue = token.value;
   String tokenInfo = token.info.value;
   if (tokenInfo == 'string') return currentTheme.string;